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php.net is the source reference.
You can use StackOverflow as a reference. Use a fresh Google page to search on your php question. It will generally find a half-dozen StackOverflow threads.
Usually better to not pose a direct question on SO, but rather to use Google to search for previous threads. It will also find references on W3Schools, and other industry specific forums.
Reading SO threads can be a bit tedious. The OP states the question, then others jump in with wrong answers and misinformation - like here. So you do need to read all the way to the bottom, then by trial and error, find what works best for your instance.
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